mcgowan



' (no Model.)

- W. S. MoGOW-AN, Jr.

HORSE'SHOE.

N0. 336,863. Patented Feb. 23, 1886.

UNITED STATES PATENT Fries.

WILLIAM S. MCGOWAN, JR, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE NEVERSLIP HORSESHOE COMPANY, OF SAME PLACE.

HORSESHOE.

SPECIFICATION forming part of Letters Patent No. 336,863, dated February 23, 1886.

Application filed May 18, 1885. Serial No. 165.894.

To all whom it may concern:

Be it known that I, WILLIAM S. MoGowAN, Jr.,ofBost0n,inthecounty ofSuffolk,andin the State of Massachusetts, have invented certain new and useful Improvements in Horseshoes; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, in which Figure 1 shows a bottom plan view of my improved horseshoe as arranged when a smooth shoe is desired; Fig. 2, asimilar View of the shoe as provided with the calks; Fig. 3, a sectional view of a portion of the shoe on line a: w of Fig. 1; Fig. 4, a sectional view on line 3 y of Fig. 2, and Fig 5 a detail perspective view of one of the calks.

Letters of like name and kind refer to like parts in each of the figures.

The object of my invention is to provide an improved horseshoe, which can be easily and quickly changed from a smooth to a calked shoe, and back again, as desired; and to this end my invention consists in the construction, arrangement, and combination of parts, as hereinafter specified.

In the drawings, A designates the shoe, pr0- vided with the usual nail-holes, a a. It is designed especially for light work, and especially for racing-horses. For such use it is 7 most desirable to have a shoe which can be changed at will, without removal, from a smooth to a calk shoe and back again. WVith this end in viewI make in the shoe the screwthreaded holes B B B B, preferably four in number, and situated two near each other at the front of the shoe, as shown, and one near the rear end of each side of the shoe. These holes are on the under side of the shoe countersunk, as shown at B. This countersink is of such depth and width around each hole as to receive and fit the head 0 of screw D when the threaded shank of the latter is screwed up into the hole B. The head of the screw, which is then flush with the underside of the shoe, is slotted deeply, so that even after considerable wear there will be slot enough for the end of a screw-driver to engage firmly. The countersink is made quite (No model.)

deep, so that the head will be thick enough 50. for a deep slot. With the screwsin place, as described, a smooth shoe is formed.

When a calk-shoe is needed, the screws are unscrewed and removed, and the threaded ends E E of calks E E are screwed into the holes B B. Each calk, as shown, consists of the threaded attaching portion E, the cylindrical or nearly cylindrical middle portion,

E, and the tapering or conical point E". These calks can be made of steel or iron, but are preferably of iron with steel cores, so as to be self-sharpening as they wear. Then a smooth shoe is desired again, the calks are unscrewed and the screws replaced.

I do not limit myself to the particular form of calk shown and described, as the form of the main'and point portions can be changed, as desired, without departure from the spirit of my invention.

With the lower ends of the holes B B coun- 7o tersunk, as set forth, there is room for screws with large and 'thick heads with deep slots, and whether the screws or calks are used the threaded portions of the holes cannot be jammed and injured in use, so as to prevent the ready removal and replacing of screws or calks. The countersinks do not fit the calks closely, but are larger than the middle portions thereof, so as to leave a space between each calk and the side of the countersink.

With this construction there is no possibility of the metal around the countersink being so jammed or driven down and inward by use as to prevent the ready and easy removal of the calk,when desired, as is liable to be the case when, as heretofore, the hole for the threaded portion of the calk has been countersunk at its lower end to fit a portion of the calk.

Having thus described my invention, what I claim isv 1. The shoe provided with holes adapted at their upper ends to receive the fastening ends of detachable calks, and countersunk at their lower ends, so as to leave spaces between the countersunk sides and the calks when the calks are in place, substantially as and for the purpose described.

2. In combination with the shoe provided In testimony that I olaim the foregoing I Withathreaded hole countersunk on thelower have hereunto set my hand this 5th day of IO side of the shoe, the removable calk having May, A. D. 1885. 7 its upper end screwed into the threaded por- 5 tion of the hole audits portion situated within MOGOWAN the countersink of such size as to leave a space "Witnesses: between it and the countersink side, substan- G. O. CARPENTER, tially as and for the purpose described. ELMER P. HOWE. 

